
On holiday on the island of Rhodes, Poirot is concerned to observe an eternal triangle between Valentine, Tony and Douglas. His concern is justified when Valentine dies after drinking a poisoned cocktail!
Published in 1936 this story has a very similar plot to that of Evil Under the Sun (1941). It was filmed for televsion in 1989 with David Suchet as Poirot. The short story is published in Murder in the Mews.